1. Ancient Mayan canals;Adams;Archaeology,1982
2. Use of cultural practices in insect pest management;Adkisson,1972
3. Los Lacandones de Mexico;Baer,1972
4. Ecological consequences of pesticides used for the control of cotton insects in Canete Valley, Peru;Barducci,1972
5. The cotton boll weevil;Barreda;Comm. Parasit. Agric. C.,1904